I hate to burst your bunuelos, but a Mexican sandwich is called a torta.
I've never heard that. I was told by various real MXicans that a taco is a sandwich. The tortilla is their bread, they use that to make a sandwich and the sandwich is called a taco.
I thought so. A torta is simply a type of sandwich. The common MXican didn't have this kind of bread available. The common bread has been the tortilla.
Mexicans call meat on bread a torta, but torta in Spanish actually means cake, so we have a whole nuther discussion - is a torta a sandwich or a cake? Let's ask the judge.